Add extra random number

Author: mayank1513

lib/src/shaders/update-vert.glsl

@@ -1,6 +1,7 @@
 #version 300 es
 
 uniform float dt;/** time delta */
+uniform float e; /** Extra random number to increase entropy */
 uniform sampler2D rg; /** random rg */
 uniform vec2 g; /** gravity - forceField */
 uniform vec2 o; /** origin*/
@@ -18,15 +19,12 @@ out vec2 oV;
 
 void main() {
   if(l <= 0.f) {
-    int i = gl_VertexID + 1000 * int(dt);
-    vec2 q = texelFetch(rg, ivec2((i + 2) % 200, 0), 0).rg;
+    int i = gl_VertexID + int(200.f * e);
     vec2 r = texelFetch(rg, ivec2(i % 200, i / 200), 0).rg;
-    float th = aR.x + r.r * (aR.y - aR.x);
-    float x = cos(th);
-    float y = sin(th);
+    float a = aR.x + r.r * (aR.y - aR.x);
     oP = o;
-    oL = lR.x + q.r * (lR.y - lR.x);
-    oV = vec2(x, y) * (sR.x + r.g * (sR.y - sR.x));
+    oL = lR.x + e * r.r * (lR.y - lR.x);
+    oV = vec2(cos(a), sin(a)) * (sR.x + r.g * (sR.y - sR.x));
   } else {
     oP = p + v * dt;
     oL = l - dt;

lib/src/simulator.ts

@@ -9,7 +9,7 @@ const random = Math.random;
 /** shader names */
 // Uniforms
 const U_DT = "dt";
-const U_RANDOM_RG = "rg";
+const U_EXTRA_RANDOM = "e";
 const U_FORCE_FIELD = "g"; /** gravity */
 const U_ORIGIN = "o";
 const U_ANGLE_RANGE = "aR";
@@ -255,6 +255,7 @@ const simulate = (
     gl.useProgram(updateProgram);
 
     setUpdateUniform(U_DT, dt / 1000);
+    setUpdateUniform(U_EXTRA_RANDOM, random());
     // skipcq: JS-0339 -- forcefield is always set by the default options
     setUpdateUniform(U_FORCE_FIELD, ...options.forceField!);
     setUpdateUniform(U_ORIGIN, mouseX, mouseY);